Diagenetic alterations related to marine transgression and regression in fluvial and shallow marine sandstones of the Triassic Buntsandstein and Keuper sequence,the Paris Basin,France |
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| Authors: | MAK El-ghali S Morad H Mansurbeg Miguel A Caja M Sirat N Ogle |
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| Institution: | 1. Department of Earth Sciences, Uppsala University, Villavägen 16, SE 752 36 Uppsala, Sweden;2. Department of Earth Science, Faculty of Science, Al-Fateh University, P.O. Box 13696, Tripoli, Libya;3. Department of Petroleum Geosciences, Universiti Brunei Darussalam, Tungku Link, Gadong BE 1410, Brunei Darussalam;4. Department of Geology and Geophysics, The Petroleum Institute, Abu Dhabi, P.O. Box 2533, Abu Dhabi, United Arab Emirates;5. Departamento de Petrología y Geoquímica, Facultad de Geología. Universidad Complutense de Madrid, 28040-Madrid, Spain;6. Environmental Engineering Research Centre, School of Civil Engineering, The Queen''s University of Belfast, Stranmillis Road, BT9 5AG, Northern Ireland |
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| Abstract: | The distribution of diagenetic alterations in Triassic fluvio-deltaic, quartzarenitic to sublitharenitic, lowstand systems tract (LST) sandstones of the Grès á Voltzia Formation, anastomosing fluvial, quartzarenitic transgressive systems tract (TST) sandstones of the Grès á Roseaux Formation, and shallow marine, quartzarenitic to sublitharenitic, TST sandstones of the Grès Coquiller Formation, the Paris Basin (France), can be linked to transgression and regression events, and thus to the sequence stratigraphic context. Near-surface eogenetic alterations, which display a fairly systematic link to the depositional facies and sequence stratigraphic framework, include: (i) cementation by meteoric water calcite (δ18O=−8.9‰ and δ13C=−9.1‰) in the fluvio-deltaic, LST sandstones, (ii) cementation by mixed marine–meteoric calcite (δ18O=−5.3‰ to −2.6‰ and δ13C=−3.9‰ to −1.3‰) and dolomite (δ18O=−4.6‰ to −2.6‰ and δ13C=−2.9‰ to −2.3‰) in the foreshore, TST sandstones and below parasequence boundaries (PB), and transgressive surface (TS), and in the shoreface, TST sandstones below maximum flooding surfaces (MFS), being facilitated by the presence of carbonate bioclasts, (iii) dissolution of detrital silicates and precipitation of K-feldspar overgrowths and kaolinite, particularly in the fluvio-deltaic, LST sandstones owing to effective meteoric water circulation, and (vi) formation of autochthonous glauconite, which is increases in abundance towards the top of the fluvio-deltaic, LST sandstones, and along TS, and in the shoreface, TST sandstones, by alteration of micas owing to the flux of seawaters into the sandstones during transgression, whereas parautochthonous glauconite is restricted to the TS sandstones owing to marine reworking. Mesogenetic alterations, which include cementation by quartz overgrowths and illite, display fairly systematic link to fluvio-deltaic, LST sandstones. This study has revealed that linking of diagenesis to transgression and regression events enables a better understanding of the parameters that control the spatial and temporal distribution of diagenetic alterations in sandstones and of their impact on reservoir quality evolution. |
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| Keywords: | Fluvio-deltaic Shallow marine Transgression and regression Sandstone diagenesis Sequence stratigraphy Triassic Paris Basin |
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